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nhiều quá :((
\(a,2\left(x-5\right)-3\left(x+7\right)=14\)
\(2x-10-3x-21=14\)
\(-x-31=14\)
\(-x=45\)
\(x=45\)
\(b,5\left(x-6\right)-2\left(x+3\right)=12\)
\(5x-30-2x-6=12\)
\(3x-36==12\)
\(3x=48\)
\(x=16\)
\(c,3\left(x-4\right)-\left(8-x\right)=12\)
\(3x-12-8+x=0\)
\(4x-20=0\)
\(4x=20\)
\(x=5\)
Cố nốt nha bn !
cảm ơn, bn nha:)))
mà hình như bạn TOP 3 trả lời câu hỏi pải ko nhỉ???
Giải:
a) \(\dfrac{-5}{6}-x=\dfrac{7}{12}+\dfrac{-1}{3}\)
\(\dfrac{-5}{6}-x=\dfrac{1}{4}\)
\(x=\dfrac{-5}{6}-\dfrac{1}{4}\)
\(x=\dfrac{-13}{12}\)
b) \(2.\left(x-\dfrac{1}{3}\right)=\left(\dfrac{1}{3}\right)^2+\dfrac{5}{9}\)
\(2.\left(x-\dfrac{1}{3}\right)=\dfrac{1}{9}+\dfrac{5}{9}\)
\(2.\left(x-\dfrac{1}{3}\right)=\dfrac{2}{3}\)
\(x-\dfrac{1}{3}=\dfrac{2}{3}:2\)
\(x-\dfrac{1}{3}=\dfrac{1}{3}\)
\(x=\dfrac{1}{3}+\dfrac{1}{3}\)
\(x=\dfrac{2}{3}\)
c) \(\left|2x-\dfrac{3}{4}\right|-\dfrac{3}{8}=\dfrac{1}{8}\)
\(\left|2x-\dfrac{3}{4}\right|=\dfrac{1}{8}+\dfrac{3}{8}\)
\(\left|2x-\dfrac{3}{4}\right|=\dfrac{1}{2}\)
\(\Rightarrow\left[{}\begin{matrix}2x-\dfrac{3}{4}=\dfrac{1}{2}\\2x-\dfrac{3}{4}=\dfrac{-1}{2}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{5}{8}\\x=\dfrac{1}{8}\end{matrix}\right.\)
d) \(\dfrac{2}{3}x+\dfrac{1}{6}x=3\dfrac{5}{8}\)
\(x.\left(\dfrac{2}{3}+\dfrac{1}{6}\right)=\dfrac{29}{8}\)
\(x.\dfrac{5}{6}=\dfrac{29}{8}\)
\(x=\dfrac{29}{8}:\dfrac{5}{6}\)
\(x=\dfrac{87}{20}\)
1) \(\left|4-2x\right|.\dfrac{1}{3}=\dfrac{1}{3}\)
\(\left|4-2x\right|=\dfrac{1}{3}:\dfrac{1}{3}\)
\(\left|4-2x\right|=\dfrac{1}{3}.3\)
\(\left|4-2x\right|=1\)
=>\(4-2x=\pm1\)
+)\(TH1:4-2x=1\) +)\(TH2:4-2x=-1\)
\(2x=4-1\) \(2x=4-\left(-1\right)\)
\(2x=3\) \(2x=4+1\)
\(x=3:2\) \(2x=5\)
\(x=1,5\) \(x=5:2\)
Vậy x=1,5 \(x=2,5\)
Vậy x=2,5
2) \(\left(-3\right)^2:\left|x+\left(-1\right)\right|=-3\)
\(9:\left|x+\left(-1\right)\right|=-3\)
\(\left|x+\left(-1\right)\right|=9:\left(-3\right)\)
\(\left|x+\left(-1\right)\right|=-3\)
=> \(x+\left(-1\right)\) sẽ không có giá trị nào ( Vì giá trị tuyệt đối luôn luôn lớn hơn hoặc bằng 0 )
Vậy x = \(\varnothing\)
Mình trả lời câu b cho bạn nhé
2[x+7]-3[x-2]=-2
2x-14-3*x+6=-2
2x-3x-14+6=-2
-x-14+6=-2
-x-14=-2-6
-x-14=-8
-x=-8+14
-x=6
<=>x=-6
a: \(-\dfrac{5}{6}-3x=\dfrac{2}{3}\)
=>\(3x=-\dfrac{5}{6}-\dfrac{2}{3}=-\dfrac{9}{6}=-\dfrac{3}{2}\)
=>\(x=-\dfrac{3}{2}:3=-\dfrac{1}{2}\)
b: \(2x-\dfrac{5}{9}=-\dfrac{2}{3}\)
=>\(2x=-\dfrac{2}{3}+\dfrac{5}{9}=\dfrac{-6}{9}+\dfrac{5}{9}=\dfrac{-1}{9}\)
=>\(x=-\dfrac{1}{9}:2=-\dfrac{1}{18}\)
c: \(\dfrac{5}{6}-\dfrac{2}{3}x=\dfrac{7}{12}\)
=>\(\dfrac{2}{3}x=\dfrac{5}{6}-\dfrac{7}{12}=\dfrac{3}{12}=\dfrac{1}{4}\)
=>\(x=\dfrac{1}{4}:\dfrac{2}{3}=\dfrac{1}{4}\cdot\dfrac{3}{2}=\dfrac{3}{8}\)
\(a)\dfrac{-5}{6}-3x=\dfrac{2}{3}\\ 3x=\dfrac{-5}{6}-\dfrac{2}{3}\\ 3x=\dfrac{-9}{6}\\ x=\dfrac{-9}{6}\div3\\ x=\dfrac{-3}{6}\\ x=\dfrac{-1}{2}\\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \) \(b)2x-\dfrac{5}{9}=\dfrac{2}{3}\\ 2x=\dfrac{2}{3}+\dfrac{5}{9}\\ 2x=\dfrac{11}{9}\\ x=\dfrac{11}{9}\div2\\ x=\dfrac{11}{18}\) \(c)\dfrac{5}{6}-\dfrac{2}{3}x=\dfrac{7}{12}\\ \dfrac{2}{3}x=\dfrac{5}{6}-\dfrac{7}{12}\\ \dfrac{2}{3}x=\dfrac{3}{12}\\ x=\dfrac{3}{12}\div\dfrac{2}{3}\\ x=\dfrac{3}{8}\)